So far there has been one clear winner — although it is perhaps slightly unfair to the others since it has already launched — Onavo. So far it is the only start-up that has a product that I downloaded onto my iPhone that very evening.

Onavo does clever things to your data, compressing images, sending you only the data you need. It claims, and I have no reason to doubt it, that it has saved me nearly 20MB. And with data roaming charges what they are, every MB counts.

iZettle, in second place, has also already launched. It is Europe’s answer to Square, a device that allows anyone with an iPhone or iPad to take a payment from any chip-enabled card. Its potential for shops is obvious, but it is exactly this sort of democratization of technology that has often unforeseen consequences.

Establishing trust and online identity is a huge problem, and without the conduct of ecommerce any business is hampered. That is why MyID.is comes in third. An incredibly ambitious model (and there has to be questions about how it will scale), it attempts to bridge the online and offline worlds, using trusted agents to certify an individual’s identity. Founder Charles Nouyrit cut a deal with the French post office to get postal workers to act as agents.

Navigating inside buildings is surprisingly difficult. GPS signals are too weak to penetrate and while there are surprisingly accurate silicon based solutions, 13th Lab used the camera to identify with subcentimeter accuracy where you are. The application of such technology is not hard to see.

Finally a punt. He has no shipping product, so it is impossible to verify the claims of Erdem Ozkan, of SmartNews. He claims to be able to identify which stories are going to go viral on social media. If he really can do that, and he says tests show a 95% success rate so far, then he is onto a winning product.

After Dublin, I will pick the next five from the second half of the tour, and then a grand champion.

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Tech Europe covers Europe’s technology leaders, their companies, and the people and industries that support them — and their ideas. The blog is edited by Ben Rooney, with contributions from The Wall Street Journal and Dow Jones Newswires.